Work around a bug in fast_io

src/FileSink.cpp

@@ -53,14 +53,16 @@ FileSink::FileSink(AbsPathView filepath, Mode mode, Flags flags) noexcept
 	{
 	case Mode::CreateOrOpen:
 		fmode |= fast_io::open_mode::creat;
-		// fall through
+		break;
 	case Mode::Open:
 		break;
 	case Mode::CreateOrOpenAndClear:
-		fmode |= fast_io::open_mode::creat;
+		//fmode |= fast_io::open_mode::creat; //cannot pass this, seems like a bug in fast_io. If it's passed, the mode reverts to OPEN_ALWAYS
-		// fall through
+		fmode |= fast_io::open_mode::trunc;
+		break;
 	case Mode::OpenAndClear:
 		fmode |= fast_io::open_mode::trunc;
+		fmode |= fast_io::open_mode::excl;
 		break;
 	case Mode::CreateIfNew:
 		fmode |= fast_io::open_mode::creat;

src/zip/ZipPack.cpp

@@ -36,6 +36,13 @@ void my_zip_close(zip* file)
 	fs_zip_close(file);
 }
 
+uint64_t computePersistentHash(const AbsPath& path)
+{
+	uint64_t hash = 0;
+	for (const tl::string& e : path)
+		tl::hash_and_combine(hash, e);
+	return hash;
+}
 uint64_t computePersistentHash(AbsPathView path)
 {
 	uint64_t hash = 0;

src/zip/ZipUtils.cpp

@@ -5,7 +5,6 @@
 #include "fs/WritableFolderPack.h"
 #include "fs/CopyStream.h"
 #include "fs/zip/ZipWriter.h"
-#include "fs/zip/DeflateFileWriter.h"
 
 namespace fs
 {